My Mac doubling up files?

[smknSRT8]

So I was using the app WhatSizeIsIt to see what is taking up so much space and saw that the total hard drive is roughly 80gb used, leaving about 30 remaining. How come I see that in the applications folder my iTunes is this:
http://i480.photobucket.com/albums/rr167/smknSRT8/iTunesApplications-1.jpg
and in the Music folder it is this:
http://i480.photobucket.com/albums/rr167/smknSRT8/iTunesMusic.jpg
Is my computer doubling up on my files?
The same thing happens for my Azureus downloads.
http://i480.photobucket.com/albums/rr167/smknSRT8/AzureusApplications-1.jpg
http://i480.photobucket.com/albums/rr167/smknSRT8/AzureusDocuments.jpg


My thing is that in the Places directory, the sum of the parts should equal the total for Macintosh HD, right? Why is it doubling up on Azureus and My Music?

[acosmichippo]

both sets are showing you the same directory.

/Users/username/Music/iTunes Music

and

/Users/username/Documents/Azureus

[smknSRT8]

How come when I add up all the GB in the "Places" it adds up to the total Macintosh HD Total space?

[acosmichippo]

if you do that, you ARE counting everything twice. Your "username" folder includes music, documents, movies, library, etc... If you add-up everything in THAT column, you will see it's about 45.5GB, which is what is listed under your username in places.

So what you're probably wondering is if your user folder is only 45GB, what is taking up the rest of the space? To check this you need to open up your root directory (the first-level of your HD). There you will find something like this:

http://img.skitch.com/20090213-mxrfi1h8nsrasuxde5yhbdj9te.jpg

obviously yours will look a little different, but you should still see that your Applications, Library, and System folders will also take up quite a bit of space.